44831981 has 4 divisors (see below), whose sum is σ = 45275964. Its totient is φ = 44388000.

The previous prime is 44831977. The next prime is 44831993. The reversal of 44831981 is 18913844.

44831981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42367081 + 2464900 = 6509^2 + 1570^2 .

It is a cyclic number.

It is not a de Polignac number, because 44831981 - 2² = 44831977 is a prime.

It is a super-2 number, since 2×44831981² = 4019813040768722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44831951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221840 + ... + 222041.

It is an arithmetic number, because the mean of its divisors is an integer number (11318991).

Almost surely, 2^44831981 is an apocalyptic number.

It is an amenable number.

44831981 is a deficient number, since it is larger than the sum of its proper divisors (443983).

44831981 is a wasteful number, since it uses less digits than its factorization.

44831981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443982.

The product of its digits is 27648, while the sum is 38.

The square root of 44831981 is about 6695.6688239488. The cubic root of 44831981 is about 355.2460926721.

The spelling of 44831981 in words is "forty-four million, eight hundred thirty-one thousand, nine hundred eighty-one".